Atomic Theory and Structure

Isotopes are atoms of the same element with a different amount of

• protons

• neutrons

• electrons

• charge

An atom has 10 protons and a mass of 18. It has __ neutrons

• 10
• 18
• 28
• 8

An ______________ is the same element, with the same number of protons, but different numbers of neutrons

• Atom
• Isotope
• Atomic Number
• Mass Number

How many neutrons will an atom have it has an atomic number of 26, an atomic mass of 58 and a charge of +3?

• 26
• 58
• 32
• 3

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?

• 34
• 36
• 2
• 40

How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?

• 20
• 10
• 2
• 18

What charge does an atom have if it GAINS an electrons?

• Positive (+)
• Negative (-)

Which particle does not contribute mass to the atom?

• Proton
• Neutron
• Electron
• Nucleus

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

In a correctly written symbol what would be located in the "A" position?

• number of neutrons
• atomic number
• number of electrons 
• mass number